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J. W. GRISWOLD. @RATE PoR sToVEs AND FURNAGES.-

.No 73,800, Patented Jan. 28, 1868.

l l I x l l l l l Ilni l l l JOHN W. GRIS-WOLD, OF PHILADELPHIA, PENNSYLVANIA.

Lena-s Paten: No. 78,800, and January 28,` 1868.'

IMPROVEMENT IN GRATES POR STOVES AND FURNAGES.

'dln tlgemle infirm tuin lgtse Enters @anni mit mating ,un-rt uf the stmt.

TO ALL WHOM IT MAY CONCERN:

Be it known that I, .Tomi W. GnrswoLD, ot' Philadeiphia, in the county of Philadelphia, and State of Pennsylvania, have invented a. new and nscfulImprovement in Gratesfor Stoves and Furnaces, die.; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable those skilled in the art to make and use the same, reference boing had to the accompanying drawings, forming part of this specification.

Figure 1 represents a partial vertical section of' my improved rotary conial grate.

Figure 2 represents a bottom view.

Similarletters of reference indicate corresponding parts.

This invention relates to an improvement in the construction of grates to'be used forstoves, heaters,L

furnaces for psteam-boilers, or other purposes; and it consists in a conical grate set in the bottom of a cylin-` drical fire-chamber, in connection with gearing operated by a crank to rotate it, and having the convez side' upward, so that, while the fmer'ashes shall fall through the grate, the larger pieces of cinder and slate vwill fall down around the side'of the cone, where they are crushed and ground to powder, by the rotation of the grate, between teeth on the periphery of thc conical grate at its base, and on the inside of the base of the cylinder around the grate, as hereinafter described. A represents a cylindrical fire-chamber, in the bottom of which is the conical cast-iron grate B, having radial bars, a a, and its convex side upward. A. central shaft, Z, is cast on the concave side of the grato, and is pivoted on a cross-shaft, c, under the grate, by which shaft the grate may be upset, as usual, when necessary. On the under side of the rim of the conical grate arc coge, d d, that 4gear into a pinion, e, on a short crankshaft, g, by which the grate is rotated. The pinion c supports the grate on one side, and on the-opposite side it is supported-hy a slide bar, z, 'which is drawn vfrom under when the grate is to be upset. At the periphery of the grateLand the inside'of the base of the cylinder, are teeth, it', which catch and crush cinder and slate.

Itwill be seen that, with a. grate tliusconstructed and arranged, the fine ashes will fall through the bars readily, while the larger pieces of slate, clinker, orcinder, will fall to the base of the conical grate, and be ground t'o powder, by the teeth around the periphery, when .the'grate is rotated.

Having thus described my invention,I claim as new'rnnd desire to secure hylietters Patent- The conical rotating grate B, in combination with. the cylinder A, both provided with teeth z'z'at the base, constructed, arranged, and operating substantially as and for the purpose herein described.

JNO. W.. GRISWOLD. 

